What does the idiom "pull a long face" mean?

• The idiom "pull a long face" means - To look unhappy or disappointed.

• Pull a long face:
- English Meaning: (to have) An unhappy or disappointed expression.
- Bangla Meaning: মুখ গোঁজ গোঁজ করা, মুখ গোঁজ করে থাকা।

• Example Sentence: Don’t pull a long face; everything will be fine.
- Bangla Meaning: দুঃখ করো না; সব ঠিক হয়ে যাবে।

Source: Merriam & Webster Dictionary, Oxford Dictionary, Accessible Dictionary.